"Using an on-site device to "ping" mobile phones, the store may track the phone's MAC address for "up to 2/10ths of a mile." This technology would allow easier apprehension of criminals after the fact."
The 'tracking' part sounds pretty far-fetched. (read: marketing hype)
Let's play out the scenario.
Perp robs a CVS with his mobile phone in his pocket. (could happen)
On-site device pings this mobile phone during the commission of the robbery, capturing the mobile phones MAC address. (could happen)
Cops show up in good time, consult the on-site 'tracking device' and catch the perp counting his loot behind a dumpster in some alley less than 1050 feet away from the CVS he just robbed. (never happen)
How does this on-site device purport to 'track' a mobile phone anyway? Without triangulation, I would think the only thing it could provide is simple distance from pinging device - not direction, and certainly not location.